== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:27:23 (1784946443)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14012     1257292   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18624     1252680   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23924     3583096   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19628     3587392   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre